using regexp with negative and positive floating numbers

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sermet
sermet 2017-5-24
评论： Alberto Fernandez Osorio 2022-5-11
data =
'0.00640869<'
'0.00640869<'
'-0.00598145'
'-0.00598145'
'-0.0010376<'
'-0.0010376<'
'-0.00604248'
'-0.00213623'
'0.00567627<'
'-0.00219727'
'0.00567627<'
% 11x1 cell
to remove the non-numeric character;
data_num = regexp(data,'[0-9]+.[0-9]+', 'match');
In this case, negative signs (-) are also removed. How can I modify this code to get - signs?

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Stephen23
Stephen23 2017-5-24
编辑：Stephen23 2017-5-24
regexp(data,'[+-]?\d+\.?\d*', 'match');
Notes:
  1. important: . does NOT match the period character, but in fact it matches any character. To only match the period, you need to escape it: \.
  2. \d matches any digit, and is simpler than writing [0-9]
  3. by making the decimal fraction optional my answer will also match integer values
Read the MATLAB documentation for more information:
https://www.mathworks.com/help/matlab/matlab_prog/regular-expressions.html
You might also like to try my FEX submission, which lets you experiment with regular expressions and see their output in real time (as you type):
https://www.mathworks.com/matlabcentral/fileexchange/48930-interactive-regular-expression-maker
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Stephen23
Stephen23 2017-5-24
编辑：Stephen23 2017-5-24
@Walter Roberson: the tests I just ran showed that your code is actually slightly slower (1e5 iterations):
Elapsed time is 3.67537 seconds. % \.?\d*
Elapsed time is 3.91039 seconds. % (\.\d*)?
I have no idea how TMW implements this, or whether it would be stable between versions...

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